Staking: Creeping varieties of sedums do not need staking. Clumping varieties can get floppy if they don't get enough sun, have too much nitrogen fertilizer, or get old. To keep your clumping sedum erect, especially when flowering, wrap twine or a low metal wire around the plants before they flower. You can also plant clumping varieties together in groups to support each other or next to sturdy other perennials, such as dwarf asters, to help support them.
Watering: Sedums are succulents and very drought tolerant. Keep newly planted sedums well-watered the first year. Once established, they should grow fine without any additional watering. In fact, too much water can cause sedum stems and roots to rot and die. That's why well-drained soil is imperative to keeping sedums healthy.
Fertilizing: Sedums tolerate low-fertility soils. A soil too rich in nitrogen can cause clumping plants to flop and flower later. Adding a 1 inch thick layer of compost when planting and annually in spring should be enough to keep your sedums growing and flowering strong.
Mulching: Because sedums need well drained soil, only lightly mulch with bark mulch to keep weeds away. Keep organic mulches away from the crown of the plant to prevent rotting. Sedums look great in rock gardens, so mulching with gravel not only is attractive and helps maintain soil moisture, it also helps keep the soil well drained.